From: Michael Wolf <mjw@linux.vnet.ibm.com>
To: linux-kernel@vger.kernel.org
Cc: kvm@vger.kernel.org, peterz@infradead.org, mtosatti@redhat.com,
glommer@parallels.com, mingo@redhat.com, avi@redhat.com,
anthony@codemonkey.ws
Subject: [PATCH RFC V2 1/5] Alter the amount of steal time reported by the guest.
Date: Tue, 16 Oct 2012 21:24:01 -0500 [thread overview]
Message-ID: <20121017022400.16949.75591.stgit@lambeau> (raw)
In-Reply-To: <20121017022249.16949.2775.stgit@lambeau>
Modify the amount of stealtime that the kernel reports via the /proc interface.
Steal time will now be broken down into steal_time and consigned_time.
Consigned_time will represent the amount of time that is expected to be lost
due to overcommitment of the physical cpu or by using cpu capping. The amount
consigned_time will be passed in using an ioctl. The time will be expressed in
the number of nanoseconds to be lost in during the fixed period. The fixed period
is currently 1/10th of a second.
Signed-off-by: Michael Wolf <mjw@linux.vnet.ibm.com>
---
fs/proc/stat.c | 9 +++++++--
include/linux/kernel_stat.h | 1 +
2 files changed, 8 insertions(+), 2 deletions(-)
diff --git a/fs/proc/stat.c b/fs/proc/stat.c
index e296572..cb7fe80 100644
--- a/fs/proc/stat.c
+++ b/fs/proc/stat.c
@@ -82,7 +82,7 @@ static int show_stat(struct seq_file *p, void *v)
int i, j;
unsigned long jif;
u64 user, nice, system, idle, iowait, irq, softirq, steal;
- u64 guest, guest_nice;
+ u64 guest, guest_nice, consign;
u64 sum = 0;
u64 sum_softirq = 0;
unsigned int per_softirq_sums[NR_SOFTIRQS] = {0};
@@ -90,10 +90,11 @@ static int show_stat(struct seq_file *p, void *v)
user = nice = system = idle = iowait =
irq = softirq = steal = 0;
- guest = guest_nice = 0;
+ guest = guest_nice = consign = 0;
getboottime(&boottime);
jif = boottime.tv_sec;
+
for_each_possible_cpu(i) {
user += kcpustat_cpu(i).cpustat[CPUTIME_USER];
nice += kcpustat_cpu(i).cpustat[CPUTIME_NICE];
@@ -105,6 +106,7 @@ static int show_stat(struct seq_file *p, void *v)
steal += kcpustat_cpu(i).cpustat[CPUTIME_STEAL];
guest += kcpustat_cpu(i).cpustat[CPUTIME_GUEST];
guest_nice += kcpustat_cpu(i).cpustat[CPUTIME_GUEST_NICE];
+ consign += kcpustat_cpu(i).cpustat[CPUTIME_CONSIGN];
sum += kstat_cpu_irqs_sum(i);
sum += arch_irq_stat_cpu(i);
@@ -128,6 +130,7 @@ static int show_stat(struct seq_file *p, void *v)
seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(steal));
seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(guest));
seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(guest_nice));
+ seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(consign));
seq_putc(p, '\n');
for_each_online_cpu(i) {
@@ -142,6 +145,7 @@ static int show_stat(struct seq_file *p, void *v)
steal = kcpustat_cpu(i).cpustat[CPUTIME_STEAL];
guest = kcpustat_cpu(i).cpustat[CPUTIME_GUEST];
guest_nice = kcpustat_cpu(i).cpustat[CPUTIME_GUEST_NICE];
+ consign = kcpustat_cpu(i).cpustat[CPUTIME_CONSIGN];
seq_printf(p, "cpu%d", i);
seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(user));
seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(nice));
@@ -153,6 +157,7 @@ static int show_stat(struct seq_file *p, void *v)
seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(steal));
seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(guest));
seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(guest_nice));
+ seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(consign));
seq_putc(p, '\n');
}
seq_printf(p, "intr %llu", (unsigned long long)sum);
diff --git a/include/linux/kernel_stat.h b/include/linux/kernel_stat.h
index 36d12f0..c0b0095 100644
--- a/include/linux/kernel_stat.h
+++ b/include/linux/kernel_stat.h
@@ -27,6 +27,7 @@ enum cpu_usage_stat {
CPUTIME_STEAL,
CPUTIME_GUEST,
CPUTIME_GUEST_NICE,
+ CPUTIME_CONSIGN,
NR_STATS,
};
next prev parent reply other threads:[~2012-10-17 2:24 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-17 2:23 [PATCH RFC V2 0/5] Separate consigned (expected steal) from steal time Michael Wolf
2012-10-17 2:24 ` Michael Wolf [this message]
2012-10-17 2:24 ` [PATCH RFC V2 2/5] Expand the steal time msr to also contain the consigned time Michael Wolf
2012-10-17 2:24 ` [PATCH RFC V2 3/5] Add the code to send the consigned time from the host to the guest Michael Wolf
2012-10-17 2:24 ` [PATCH RFC V2 4/5] Add a timer to allow the separation of consigned from steal time Michael Wolf
2012-10-17 2:24 ` [PATCH RFC V2 5/5] Add an ioctl to communicate the consign limit to the host Michael Wolf
2012-10-17 17:14 ` [PATCH RFC V2 0/5] Separate consigned (expected steal) from steal time Glauber Costa
2012-10-17 15:13 ` Michael Wolf
2012-10-22 15:33 ` Rik van Riel
2012-11-26 20:00 ` Michael Wolf
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